Question about Ford Expedition
The knock under the dash board from the center to the passenger side. it appears to be only when the A/C is on or the fan. It will knock for about 5 seconds then will get quiet and then knock again a few minutes later.. Since this began it is also knocking as soon as we turn the vehicle on.
It tercould be a blend door motor,Try get in turn off everying.Then start it and if you here anything,if not turn on the heater and turn the hot and cold switch. see if it stops.a nother thing open the hood start it up check the passenger front end see if you hear it up there. if so i think the air compressor for air ride is there.
Posted on Oct 28, 2012
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Posted on Jan 02, 2017
SOURCE: I have a 2009 Dodge
sounds like u have an electric mode door motor,in ur hvac housing stripped . move the mode selector to different positions to amplify noise an sort of control noise. u have a blend air door motor, mode position motor, for example inside air an outside air recirculating door motor, or defroster mode motor or actuate the heater position an u should b able to control noise by changing modes, thats wen u know u found it wen u can make the noise come an go. also one of ur selector positions is obviously not workin due to a stripped motor or broken blend door. good luck
Posted on Apr 09, 2011
this is a white box on the other side of the passangers dash board. lift up the bonnet and disconnect it. that will stop the noise but now your heaters will only get warm instead of hot. its some sort of flap to do with the heater matrix. realy anoying
Posted on Mar 04, 2010
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